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7.0
May 14, 2020
05/20
by
Munowitz, M. (Michael)
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xiv, 289 pages : 24 cm
Topics: kernmagnetische resonantiespectroscopie, nuclear magnetic resonance, quantum mechanics,...
10
10.0
May 22, 2020
05/20
by
Němcová, Irena
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vi, 250 pages : 24 cm
Topics: Chemical reactions, Spectrum analysis, Spektralfotometrie, Chemische Reaktion, CHEMICAL REACTIONS,...
8
8.0
Jan 10, 2020
01/20
by
Bovey, Frank A. (Frank Alden), 1918-2003
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ix, 396 pages 25 cm
Topics: nuclear magnetic resonance spectroscopy, kernmagnetische resonantiespectroscopie, Analytische...
4
4.0
Mar 28, 2019
03/19
by
Murrell, J. N. (John Norman)
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32 p. 24 cm
Topics: Aromatic compounds, Chemistry, Analytic -- Quantitative, Spectrum analysis
Telemetry-equipped rats were subjected to hyperthermia (H, T sub c) = 41.5 deg C) with and without dehydration (D 9% loss of body weight) stresses. Time domain and spectral analysis of heart rate variability indicated that the dehydrated hyperthermic (DH) rats had increased sympathetic activity compared to H rats, and DH rats had decreased discriminated the more physiologically stressful of these states. These non-invasive measures of physiological strain discriminated the more physiologically...
Topics: DTIC Archive, Matthew, Candance B, ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL...
The two-dimensional maximum entropy spectral estimation method proposed by Lim and Malik is studied and modified for spectral analysis of texture images. The computational efficiency of the algorithm makes it feasible for minicomputer implementation to extract effective spectral domain texture features for texture discrimination. Extensive computer results are presented.
Topics: DTIC Archive, Chen, C H, SOUTHEASTERN MASSACHUSETTS UNIV NORTH DARTMOUTH DEPT OF ELECTRICAL AND...
In this paper, an algebraic characterization is made of the problem of resolving two or more closely spaced (in frequency wave number) plane waves incident on a linear array. This algebraic characterization in turn suggests a number of adaptive procedures for effecting the desired resolution. One of these procedures is herein empirically shown to provide significantly better performance when compared to other contemporary procedures used in array processing such as the Wiener filter, Pisarenko...
Topics: DTIC Archive, Cadsow,James A, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF...
In this work, transcranial Doppler signals recorded from the temporal region of brain on 35 patients were transferred to a personal computer (PC) via 16 bit sound card. FFT, AR and WT methods were applied to transcranial Doppler for obtaining sonograms. Spectral analysis were obtained in order to compare with three methods in the case of medical diagnosis. The comparison shows that WT method offers better results for the spectral resolution than the other methods. This also leads the...
Topics: DTIC Archive, Gueler, I, GAZI UNIV ANKARA (TURKEY), *FAST FOURIER TRANSFORMS, *SPECTRUM ANALYSIS,...
Much progress has been made in regional seismic discrimination over the past ten years. Aided by the availability of high-quality waveforms and ground-truth databases, researchers discovered the discrimination capabilities of Lg/P and S/P spectral ratios, especially at high frequencies. However, when spectral ratios or signal parameters which perform well in one geographic area are applied to events in another, the results are typically uncertain or erroneous. This was illustrated during the...
Topics: DTIC Archive, Pulli, Jay J., RADIX SYSTEMS INC ROCKVILLE MD, *SEISMIC DETECTION, *ARMS CONTROL,...
Langmuir Blodgett monolayers of a series of anthroyl substituted alkanoic (fatty) acid derivatives are used as model systems to study the interaction of low energy electrons with organic polymers in high resolution electron energy loss spectrometry. The variation of structure in the series effectively places the anthroyl functionality at various depths from the monolayer vacuum surface. The HREELS analysis of these systems provides a means to probe the depth dependence of vibrational energy...
Topics: DTIC Archive, Weitzsacker, Cara L., STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY, *HIGH...
A simple method is presented for diagnosing the electron temperature and density of a rapidly heated, coronal-type plasma from observable, non-equilibrium enhancements of X-ray line emission. This method, it is argued, is applicable to the study of solar flares. Accordingly, theoretically predicted line enhancements are given for a representative selection of X-ray lines prominent in the preflare coronal emission spectrum. Some of these predicted line enhancements should soon be observable with...
Topics: DTIC Archive, Shapiro,Paul R, STANFORD UNIV CALIF INST FOR PLASMA RESEARCH, *HEATING, *SOLAR...
Turbine tip clearance design and prediction techniques have been limited to analytical methods for lack of an accurate direct measurement device. It was the purpose of this program to substantiate prediction correlations utilizing direct measurements from a laser-powered miniaturized turbine tip clearance device (MTCMD) previously developed under Applied Technology Laboratory support. The resultant comparisons of measured versus analytically determined clearances based on measured temperatures...
Topics: DTIC Archive, Baker,Lawrence C, GENERAL ELECTRIC CO LYNN MA AIRCRAFT ENGINE GROUP, *MEASURING...
Contents: Quantum Detection and Sensing of Radiation; Physical Properties and Effects in Electronic Materials; Energy Transfer and Relaxation in Small Polyatomic Molecules; Energy Transfer and Relaxation in Alkali Metals; Picosecond Energy Transfer and Photofragmentation Spectroscopy; Generation and Control of Radiation.
Topics: DTIC Archive, Flynn,George W, COLUMBIA RADIATION LAB NEW YORK, *OPTICAL ANALYSIS, *ELECTROMAGNETIC...
5
5.0
Jul 16, 2019
07/19
by
Nakamoto, Kazuo, 1922-
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xi, 382 p. : 23 cm
Topics: Chelates -- Spectra, Spectrum analysis
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5.0
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xiv, 488 p. : 25 cm
Topic: Spectrum analysis
We present data from simultaneous Chandra, XMM-Newton and BeppoSAX observations of the Seyfert 1 galaxy NGC 3516, taken during 2001 April and November. We have investigated the nature of the very flat observed X-ray spectrum. Chandra grating data show the presence of X-ray absorption lines, revealing two distinct components of the absorbing gas, one which is consistent with our previous model of the UV/X-ray absorber while the other, which is outflowing at a velocity of approximately 1100...
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, X RAY ABSORPTION, K LINES, IRON, SPECTRUM...
This paper describes a novel approach based on the use of coherence functions and statistical theory for sensor validation in a harsh environment. By the use of aligned and unaligned coherence functions and statistical theory one can test for sensor degradation, total sensor failure or changes in the signal. This advanced diagnostic approach and the novel data processing methodology discussed provides a single number that conveys this information. This number as calculated with standard...
Topics: NASA Technical Reports Server (NTRS), SPECTRUM ANALYSIS, STATISTICAL ANALYSIS, DEGRADATION,...
We discuss new functionality of the spectral simulation code CLOUDY which allows the user to calculate grids with one or more initial parameters varied and formats the predicted spectra in the standard FITS format. These files can then be imported into the x-ray spectral analysis software XSPEC and used as theoretical models for observations. We present and verify a test case. Finally, we consider a few observations and discuss our results.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, SPECTRUM...
The UV-Vis spectroscopic system for plume diagnostics monitors rocket engine health by using several analytical tools developed at Stennis Space Center (SSC), including the rocket plume spectroscopy simulation code (RPSSC), to identify and quantify the alloys from the metallic elements observed in engine plumes. Because the hydrocarbon-fueled rocket engine is likely to contain C2, CO, CH, CN, and NO in addition to OH and H2O, the relevant electronic bands of these molecules in the spectral...
Topics: NASA Technical Reports Server (NTRS), ROCKET ENGINES, PLUMES, SPECTRUM ANALYSIS, HYDROCARBON...
Spectral Analysis Tool 6.2 is the latest version of a computer program that assists in analysis of interference between radio signals of the types most commonly used in Earth/spacecraft radio communications. [An earlier version was reported in Software for Analyzing Earth/Spacecraft Radio Interference (NPO-20422), NASA Tech Briefs, Vol. 25, No. 4 (April 2001), page 52.] SAT 6.2 calculates signal spectra, bandwidths, and interference effects for several families of modulation schemes. Several...
Topics: NASA Technical Reports Server (NTRS), SPECTRUM ANALYSIS, COMPUTER PROGRAMS, RADIO COMMUNICATION,...
An improved method of measuring chromatic dispersion in an optical fiber or other device affords a lower (relative to prior such methods) limit of measurable dispersion. This method is a modified version of the amplitude-modulation (AM) method, which is one of the prior methods. In comparison with the other prior methods, the AM method is less complex. However, the AM method is limited to dispersion levels . 160 ps/nm and cannot be used to measure the symbol of the dispersion. In contrast, the...
Topics: NASA Technical Reports Server (NTRS), OPTICAL FIBERS, AMPLITUDE MODULATION, LIGHT (VISIBLE...
Electromechanical resonators of a proposed type would comprise single carbon nanotubes suspended between electrodes (see Figure 1). Depending on the nanotube length, diameter, and tension, these devices will resonate at frequencies in a range from megahertz through gigahertz. Like the carbon-nanotube resonators described in the preceding article, these devices will exhibit high quality factors (Q values), will be compatible with integration with electronic circuits, and, unlike similar devices...
Topics: NASA Technical Reports Server (NTRS), CARBON NANOTUBES, ELECTROMECHANICS, RADIO FREQUENCIES,...
A spectroscopic Doppler velocimetry technique has been developed for measuring two transverse components of velocity and hence streamwise vorticity in free jet flows. The nonintrusive optical measurement system uses Mie scattering from a 200 mW green continuous-wave laser interacting with dust and other tracer particulates naturally present in the air flow to measure the velocities. Scattered light is collected in two opposing directions to provide measurements of two orthogonal velocity...
Topics: NASA Technical Reports Server (NTRS), VELOCITY MEASUREMENT, VORTICITY, FREE JETS, OPTICAL...
Disclosed herein are systems, methods, and non-transitory computer-readable storage media for progressive band selection for hyperspectral images. A system having module configured to control a processor to practice the method calculates a virtual dimensionality of a hyperspectral image having multiple bands to determine a quantity Q of how many bands are needed for a threshold level of information, ranks each band based on a statistical measure, selects Q bands from the multiple bands to...
Topics: NASA Technical Reports Server (NTRS), IMAGE PROCESSING, SPECTRUM ANALYSIS, SPECTRAL BANDS, COMPUTER...
State-of-the-art spectral analysis of hot stars by means of non-LTE model-atmosphere techniques has arrived at a high level of sophistication. The analysis of high-resolution and high-S/N spectra, however, is strongly restricted by the lack of reliable atomic data for highly ionized species from intermediate-mass metals to trans-iron elements. Especially data for the latter has only been sparsely calculated. Many of their lines are identified in spectra of extremely hot, hydrogen-deficient...
Topics: NASA Technical Reports Server (NTRS), ASYMPTOTIC GIANT BRANCH STARS, HOT STARS, LOCAL THERMODYNAMIC...
Spectral measurements of the 21 cm monopole background have the promise of revealing the bulk energetic properties and ionization state of our universe from z approx. 6 - 30. Synchrotron foregrounds are orders of magnitude larger than the cosmological signal, and are the principal challenge faced by these experiments. While synchrotron radiation is thought to be spectrally smooth and described by relatively few degrees of freedom, the instrumental response to bright foregrounds may be much more...
Topics: NASA Technical Reports Server (NTRS), SPECTRUM ANALYSIS, SYNCHROTRON RADIATION, COSMOLOGY,...
The refinement of the Robert-Bonamy formalism by considering the line coupling for linear molecules developed in our previous studies [Q. Ma, C. Boulet, and R. H. Tipping, J. Chem. Phys. 139, 034305 (2013); 140, 104304 (2014)] have been extended to asymmetric-top molecules. For H2O immersed in N2 bath, the line coupling selection rules applicable for the pure rotational band to determine whether two specified lines are coupled or not are established. Meanwhile, because the coupling strengths...
Topics: NASA Technical Reports Server (NTRS), WATER VAPOR, WATER, SPECTROSCOPY, ROTATIONAL SPECTRA,...
In late 1978, the National Aeronautics and Space Administration (NASA) launched the Nimbus-7 satellite with the Coastal Zone Color Scanner (CZCS) and several other sensors, all of which provided major advances in Earth remote sensing. The inspiration for the CZCS is usually attributed to an article in Science by Clarke et al. who demonstrated that large changes in open ocean spectral reflectance are correlated to chlorophyll-a concentrations. Chlorophyll-a is the primary photosynthetic pigment...
Topics: NASA Technical Reports Server (NTRS), COASTAL ZONE COLOR SCANNER, SEA-VIEWING WIDE FIELD-OF-VIEW...
The search for evidence of life on Mars is the ultimate motivation for its scientific exploration. The results from the Phoenix mission indicate that the high N. latitude ice-rich regolith at low elevations is likely to be a recently habitable place on Mars [Stoker et al., 2010]. The near-surface ice likely provided adequate water activity during periods of high obliquity, 3 to 10 Myr ago. Carbon dioxide and nitrogen are present in the atmosphere, and nitrates may be present in the soil....
Topics: NASA Technical Reports Server (NTRS), CARBON DIOXIDE, EXTRATERRESTRIAL LIFE, HABITABILITY, MARS...
Forests are the largest aboveground sink for atmospheric carbon (C), and understanding how they change through time is critical to reduce our C-cycle uncertainties. We investigated a strong decline in Normalized Difference Vegetation Index (NDVI) from 1982 to 1991 in Pacific Northwest forests, observed with the National Ocean and Atmospheric Administration's (NOAA) series of Advanced Very High Resolution Radiometers (AVHRRs). To understand the causal factors of this decline, we evaluated an...
Topics: NASA Technical Reports Server (NTRS), FORESTS, LANDSAT SATELLITES, FIRES, INSECTS, PACIFIC...
The performance of a modified version of NASA's multivariate spectrum analysis program is discussed. A multiple regression model was used to make the revisions. Performance improvements were documented and compared to the standard fast Fourier transform by Monte Carlo techniques.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, MULTIVARIATE STATISTICAL ANALYSIS,...
The problem of finding a function which, in addition to being zero outside a specified range in x-space, has its spectral power well confined to a certain range in k-space is solved numerically. Properties of the solutions are also discussed.
Topics: NASA Technical Reports Server (NTRS), DATA PROCESSING, DIGITAL FILTERS, POWER SPECTRA, FOURIER...
The electrically scanning microwave radiometer (ESMR) on the Nimbus 5 satellite was used to observe microwave emissions from vegetated and soil surfaces over an Illinois-Indiana study area, the Mississippi Valley, and the Great Salt Lake Desert in Utah. Analysis of microwave brightness temperatures (T sub B) and antecedent rainfall over these areas provided a way to monitor variations of near-surface soil moisture. Because vegetation absorbs microwave emission from the soil at the 1.55 cm...
Topics: NASA Technical Reports Server (NTRS), MICROWAVE RADIOMETERS, NIMBUS 5 SATELLITE, SATELLITE...
A two dimensional discrete vortex model is applied to turbulent flow over a cavity at a Reynolds number based on cavity half length of approximately 500,000. These model predictions are compared with experimental data on a time average and on a spectral basis. The comparisons indicate that the vortex model reproduces the mean velocity profiles of this complex flow, while the turbulent intensity and Reynolds stress profiles are overpredicted in magnitude. Spectral analyses show that the vortex...
Topics: NASA Technical Reports Server (NTRS), AEROACOUSTICS, AERODYNAMIC NOISE, CAVITATION FLOW, CAVITY...
A computer program that calculates absorption spectra for slant paths through the atmosphere is described. The program uses an efficient convolution technique (Romberg integration) to simulate instrument resolution effects. A brief information analysis is performed on a set of calculated spectra to illustrate how such techniques may be used to explore the quality of the information in a spectrum.
Topics: NASA Technical Reports Server (NTRS), ABSORPTION SPECTRA, ATMOSPHERIC ATTENUATION, COMPUTER...
Spectral albedos of impure-nonhomogeneous snowpacks, typical of midlatitudes, from 400 to 2200 nm were modeled through a numerical solution of the radiative transfer equation in the two-stream approximation. Discrete depth-dependent values of density, grain size and impurity concentration were used to characterize the snowpacks. The model is for diffuse incident radiation, and the numerical method is based on doubling and invariant imbedding. The effect of soot impurities on snowpack albedos is...
Topics: NASA Technical Reports Server (NTRS), ABSORPTANCE, ALBEDO, SNOW COVER, SPECTRAL REFLECTANCE,...
Uranus was detected at 10.3, 11.6 and 12.5 micrometers approximately 1 micrometer spectral bandpasses, with respective brightness temperatures of 74.0 + 0.9 or -1.1, 67.6 + 0.5 or -0.7, and 65.5 + 0.6 or -0.7 K and the first detection of Neptune at 10.3 micrometers with a brightness temperature of 77.5 + 0.7 or -0.9 K. We also detected Neptune at 11.36 micrometers with 2% spectral resolution at 81.0 + 0.8 or -0.9 K. The 10 micrometers continuous of both Uranus and Neptune may in part be due to...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC COMPOSITION, INFRARED SPECTRA, NEPTUNE...
Spectral approximations for exterior elliptic problems in two dimensions are discussed. As in the conventional finite difference or finite element methods, the accuracy of the numerical solutions is limited by the order of the numerical farfield conditions. A spectral boundary treatment is introduced at infinity which is compatible with the infinite order interior spectral scheme. Computational results are presented to demonstrate the spectral accuracy attainable. Although a simple Laplace...
Topics: NASA Technical Reports Server (NTRS), BOUNDARIES, ELLIPTIC DIFFERENTIAL EQUATIONS, PROBLEM SOLVING,...
Anisotropy of cosmic rays is studied with extensive air showers (EAS) data by muon trigger. The present results support those obtained by electron trigger which suggest the significant anisotropy of second harmonics with phase around 100 deg in right ascension for showers of 10 to the 16th power - 10 to the 17th power eV, and predominant arrival direction of 230 deg in right ascension for muon-rich showers. It seems that the phase of the first harmonics in the energy range below 10 to the 11th...
Topics: NASA Technical Reports Server (NTRS), ANISOTROPY, COSMIC RAY SHOWERS, HARMONIC ANALYSIS, MUONS,...
The method of spectrographic global survey was used to study the time variations in parameters of cosmic ray (CR) pitch angle anisotropy and their relationship with the variations of some solar wind characteristics under different electromagnetic conditions in interplanetary space. A classification is made of the conditions that are accompanied by the increase in CR anisotropy.
Topics: NASA Technical Reports Server (NTRS), ANISOTROPY, COSMIC RAYS, ELECTROMAGNETISM, PITCH...
Spectral characteristics of semic-arid plant communities using 128 channel airborne imaging spectrometer (AIS) data acquired on October 30, 1984. Both field and AIS spectra of vegetation were relatively featureless and differed from substrate spectra primarily in albedo. Unvegetated sand dunes were examined to assess spectral variation resulting from topographic irregularity. Although shrub cover as low as 10% could be detected on relatively flat surfaces, such differences were obscured in more...
Topics: NASA Technical Reports Server (NTRS), ARID LANDS, IMAGING SPECTROMETERS, MINERAL EXPLORATION,...
Airborne imaging spectrometer (AIS) data were collected over a number of derelict heavy metal mine sites in the Carolina slate belt of North Carolina. A 32 channel (1156 to 1456 nm) data set was acquired in October, 1983 at the time of peak fall foliage display, and a 128 channel (1220 to 2420) data set was acquired near the end of the spring leaf flush in May, 1984. Spectral curves were extracted from the AIS data for differing ground cover types (e.g., pine forests, mixed deciduous forests,...
Topics: NASA Technical Reports Server (NTRS), IMAGE PROCESSING, IMAGING SPECTROMETERS, MINERAL EXPLORATION,...
Systematic investigations of the ultraviolet spectra of the hydrogen-rich white dwarfs were conducted with the International Ultraviolet Explorer satellite (IUE). This is to follow up on the work reported in Nelan and Wegner (1985) that the strong absorptions found earlier near lambda lambda 1600 and 1400 (cf. Greenstein 1980; Wegner 1982 and 1984, b) in the spectra of the cooler DA are absorptions produced by the H2 and H2(+) quasi-molecules. Observations of new DA white dwarfs obtained with...
Topics: NASA Technical Reports Server (NTRS), ABSORPTION SPECTRA, HYDROGEN, SPECTRAL ENERGY DISTRIBUTION,...
Polynomial interpolation methods are applied both to the approximation of functions and to the numerical solutions of hyperbolic and elliptic partial differential equations. The derivative matrix for a general sequence of the collocation points is constructed. The approximate derivative is then found by a matrix times vector multiply. The effects of several factors on the performance of these methods including the effect of different collocation points are then explored. The resolution of the...
Topics: NASA Technical Reports Server (NTRS), APPROXIMATION, PARTIAL DIFFERENTIAL EQUATIONS, PROBLEM...
The objective of NASA Grant NsG 7473 was to obtain and analyze high resolution infrared absorption spectra of various trace gases present in the Earth's upper atmosphere. The goal of the spectral analysis was to obtain values of absorption line strengths, widths and frequencies of sufficient accuracy for use in upper atmosphere trace gas monitoring. During the early phase of the grant, high resolution spectra were obtained from two instruments. One was the 0.02/cm resolution vacuum grating...
Topics: NASA Technical Reports Server (NTRS), EARTH ATMOSPHERE, SPECTRUM ANALYSIS, TRACE CONTAMINANTS,...
The Hat Creek millimeter-wave interferometer (to be known as the Berkeley-Illinois-Maryland Array, BIMA) is being upgraded. The improved array will become available during the coming solar maximum, and will have guaranteed time for solar observing. The Hat Creek millimeter-wave interferometer is described along with the improvements. The scientific objectives are briefly discussed.
Topics: NASA Technical Reports Server (NTRS), ANTENNA ARRAYS, EQUIPMENT SPECIFICATIONS, INTERFEROMETRY,...
Spectra of quasars at high z often show absorption at the Lyman limit from intervening gas systems at intermediate z having N(H) approx. greater than 10(exp 7) cm(-2). In some circumstances, N(H) can be determined by measuring the strength of the Lyman limit absorption or the damping wings of Lyman - alpha. With a spectrum taken at low wavelength resolution, say, lambda/delta lambda approx. 10(exp 3), it is usually not possible to distinguish individual Lyman series lines near the limit, yet...
Topics: NASA Technical Reports Server (NTRS), ABSORPTION SPECTRA, CONVERGENCE, LYMAN SPECTRA, QUASARS,...
Spectral analysis of 1991 wind shear flight data has provided information about the power spectral density, spectral width, and velocity of ground clutter detected by the wind shear radar at several major airports. Ground clutter must be recognized and separated from weather targets before wind shear can be computed. Information will be presented characterizing and comparing ground clutter and weather target spectra. The information includes (1) spectral widths of stationary ground clutter seen...
Topics: NASA Technical Reports Server (NTRS), CLUTTER, DOPPLER RADAR, GROUND EFFECT (COMMUNICATIONS),...
The primary objective of this research was to map as many spectrally distinct types of green vegetation (GV), non-photosynthetic vegetation (NPV), shade, and soil (endmembers) in an Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) scene as is warranted by the spectral variability of the data. Once determined, a secondary objective was to interpret these endmembers and their abundances spatially and spectrally in an ecological context.
Topics: NASA Technical Reports Server (NTRS), REMOTE SENSING, SHADOWS, SOILS, SPECTRUM ANALYSIS,...
SAX is a satellite for X-Ray astronomy. It is a major element of the overall basic Science Program of the Italian Space Agency (ASI) and is being developed with the contribution of the Netherlands Agency for Aerospace Programs (NIVR). The scientific objectives of SAX are to carry out systematic and comprehensive observations of celestial X-Ray sources over the 0.1 - 300 KeV energy range with special emphasis on spectral and timing measurements. The satellite will also monitor the X-Ray sky to...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL SATELLITES, EARTH ORBITAL ENVIRONMENTS,...
